OGT Level Manager
Lock and unlock levels easily with OGT Level Manager for Corona SDK.
Super Sprite Bundle
Royalty-free graphics for 2D games - animated characters, tile sets, etc.
Outlaw IDE
The #1 IDE for Corona SDK game and biz apps makes development even faster (free version available).
Game Development Crash Course
19 lessons and an hour of video get you started fast and free with Corona SDK game dev!
Pathfinding Tutorial
Use Corona SDK and the free Jumper library to do A* pathfinding in your games - over 60 minutes of video + sample code!